PII stands for Personal Identifiable Information. The defining aspect of PII data is that you do not want the real values in your dataset to leak. Typically, PII has a higher-level, semantic meaning and it may be possible to create other new values completely from scratch if you know the meaning.
For example, names, phone numbers or addresses are all sensitive data that you do not want to leak.
PII columns are not automatically detected. Please verify your data and manually set any sensitive columns to PII.